Another thing: I assume that most of you don't want the audio from the SFG cart going to the MSX slot audio input. It doesn't really affect the audio quality of the stereo output though. But if you do want audio going to the MSX please mention it since it involves soldering two resistors.

I removed the audio connection into the MSX on my original SFG-05. My reason was that when combined with the PSG, if the YM2151 is on the mono internal signal too, it doesn’t mix well with the stereo external signal on my mixer (they fight and cancel out).